recreational use remains illegal under federal law. the question, now, will the large crowds this weekend stall the movement to legalize marijuana? >> are they willing to pay the price for those experiments, with regard to have so many folks coming in from out of state? are they willing to regulate those folks the same way they regulate they're own citizens? or in this case, to not regulate them. >> reporter: something other states and marijuana supporters will be watching closely. akiko fujita, abc news, los angeles. >>> and coming up, breaking point in the rocky mountains. the harrowing tale of men who survived a massive avalanche that killed five of his friends. and what is so dangerous about this year in particular? and i honestly didn't think i would ever quit. [ male announcer ] along with support, chantix (varenicline) is proven to help people quit smoking. it reduces the urge to smoke. it put me at ease that you could smoke on the first week. [ male announcer ] some people had changes in behavior, thinking or mood, hostility, a